I work with a guy who writes weekly columns online, which in turn are frequently tweeted and retweeted. I'm trying to find an effective way to tabulate the frequency with which his column is tweeted. In other words, how many twitter feeds does it wind up in?

I discovered tweetreach.com last week, but wondering if there are any other good sites or anything I'm missing.

I've built a lot of such trackers in the past for various former employers, but if your co-worker doesn't mind a little manual work it's pretty simple. At any time you can enter the full canonical URL (minus any query strings or parameters tacked onto the end) into the Twitter search box on twitter.com, and you'll see everyone who has shared that URL. Make sure you click "All Tweets" (rather than the default "Top Tweets" to see all shares. For example:

The cool thing about this feature is that it doesn't matter if your URL was shared straight up or if it was shortened first via something like bit.ly. Twitter search sees all!

It also works for just domain names, so if your co-worker's columns are all published on the same site, and that site isn't something super popular like yahoo.com or huffingtonpost.com, you can do a domain search: